Overhung shear

ABSTRACT

An overhung or flying shear for cutting wire or band sections or the like from moving articles, such as rods, bands or the like, is provided with a slide for the cutting chuck, the slide being movable parallel to the direction of this movement by a crank drive which actuates at the same time the knife guided by the slide, the shear being particularly characterized by a transmission member which is directly connected with the connecting rod of the crank drive and which directly moves the knife.

Unid States atent [191 [11] 3,827,323 Jacobs Aug. 6, 1974 OVERHUNG SHEARInventor: Klaus Jacobs, Cologne-Raderthal,

Germany Assignee: Meyer, Roth & Pastor,

Cologne-Raderberg, Germany Filed: Aug. 20, 1968 App]. No.: 753,998

Foreign Application Priority Data Aug. 23, l968 Germany 1627233 U.S. Ci83/310, 83/320, 83/580 int. Cl B2301 25/02 Field of Search 83/285, 310,315-320,

References Cited UNITED STATES PATENTS Traut 83/3l8 X PrimaryExaminer-Andrew R. .luhasz Assistant Examiner-Leon Gilden Attorney,Agent, or Firm-Richards & Geier; U. Alexander Scher An overhung orflying shear for cutting wire or band sections or the like from movingarticles, such as rods, bands or the like, is provided with a slide forthe cutting chuck, the slide being movable parallel to the direction ofthis movement by a crank drive which actuates at the same time the knifeguided by the slide, the shear being particularly characterized by atransmission member which is directly connected with the connecting rodof the crank drive and which directly moves the knife.

ABSTRACT 7 Claims, 4 Drawing Figures PAIENIEDAUB 51914 SHEET 3 [IF 4INVENTOR BY J ATTA'QRNEES PATENTED 533 51974 SHEET [1F 4 IN VENTOR K] aca [35 ATT QrLNlESS OVERHUNG SHEAR This invention relates to an overhungor flying shear for cutting wire or band sections or the like frommoving articles.

Prior art shears of this type operate in that a wire pulled away, forexample, from bands, spools, reels and the like with a uniform butadjustable speed is guided through a directing device and is directed toa reciprocating cutting device. This reciprocating movement is providedby a crank drive which drives a slide with a cutter box. The number ofrevolutions of the crank drive is approximately adjusted to the speed ofwithdrawal and the cutting moment is so selected that the momentaryspeed of the crank drive during the cutting corresponds substantially tothe invariable removal speed of the wire. A knife is guided by the slideand, in accordance with this prior art construction, is moved directlyby the crank drive in a guide extending perpendicularly to the directionof movement of the wire. The movement of the crank drive is transmittedto the knife by a number of levers, particularly three levers, one ofwhich is a two-armed lever pivoted to the slide and connected on the onehand by a link to a substantially central point of the connecting rod,and on the other hand, connected by another link with the knife.

This known construction is expensive since it provides three additionaltransmitting means between the connecting rod and the knife.Furthermore, it has the drawback that it is provided with a total offive link locations or joints which are subject to wear and can becomeloose. Finally,and this is the most important drawback,this constructionis not only expensive but is also exceptionally heavy which isdetrimental since all the transmitting means participate in thereciprocating movement of the slide and thus must be accelerated andretarded. The forces which are thereby produced are quite substantial,particularly in case of high cutting speeds, and result, as alreadystated, in an untimely wear.

An object of the present invention is to eliminate these drawbacks ofprior art construction and to produce a new construction which isconsiderably simpler, which operates with a lesser number oftransmission means, which has a smaller number of joints and which thushas a lesser weight and lesser mass forces, while producing a clean cutat high output.

Other objects of the present invention will become apparent in thecourse of the following specification.

In the accomplishment of the objectives of the present invention theprior art construction with a single crank drive for all parts wasimproved by providing only one transmitting member connected directlywith the connecting rod of the crank drive and directly actuating theknife.

According to a preferred embodiment of the present invention theconnecting rod itself is provided with a second free arm the end ofwhich has a guide for the knife, the guide having the shape of a segmentof a circle and being coaxial to a bearing point in the slide; the knifeis angularly adjustable upon the guide.

This construction avoids all additional link connections so that onlythe two bearing supports for the connecting rod are necessary. Thecircular knife can be set in any desired angular position, so that thecutting point can be adjusted precisely to the prevailing feed speed ofthe wire.

If a particularly simple construction is considered to be adequate, thenonly one crank drive is used, but in that case the knife must be shiftedsidewise relatively to the connecting rod, so that the wire can movealong a straight line. If the knife is not shifted then a crossed crankdrive is necessary. Such a construction is also possible. However, it isalso possible to provide a symmetrical construction with two coaxialconnecting rods which are interconnected by means of a knife holder, sothat there is room between the two connecting rods for the moving wire.This construction is preferred for wires of larger diameters.

The simple embodiment having only one crank drive and a knife shiftedsidewise in relation to the connecting rod is advantageously soconstructed that the free arm of the connecting rod extends at an angleto the crank connected arm which is not and is for example, an obtuseangle, whereby it is particularly advantageous to locate the directionof movement of the wire to the other side of the connecting rod andshift it to the side relatively to the bearing of the connecting rod,thereby providing free passage for the wire, the adjacent constructionalparts being provided with insignificant recesses and cutouts for thisfree passage.

When the above described construction is used with a knife having theshape of a circle segment, there is the advantage that an adjustingscrew can be provided at the free arm for the knife, which can be heldsidewise in a dove-tail slot and can be tensioned, so that the angularsetting of the knife in relation to the connecting rod or to the freearm is possible by setting the adjusting screw; the supportingconnection does not present difficulties since the adjusting screwreceives the cutting forces and transmits them to the connecting rod.

An embodiment which, if desired, may be used in this connection consistsin that the knife is directly and firmly held in the free arm, althoughit is replaceably mounted, while the free arm can be angularlyadjustable in relation to the crank-held arm of the connecting rod.

A basically different embodiment of the flying shear of the presentinvention is developed from the known construction wherein the knife isnot guided circularly but along a straight line at the slide and extendsperpendicularly to the direction of movement of the wire.

The present invention can also be applied to this known construction,provided that the transmitting member again firmly connects the free armwith the crank-held arm of the connecting rod but that the end of thefree arm is allowed to engage in a linklike manner a correspondingrecess in the knife holder. The knife can be held replaceably in theknown manner in the knife holder but can be adjusted longitudinally inaccordance with the present invention to fix the precise engagementrange. While this embodiment has one more joint than the one previouslydescribed, it provides a saving of four joints and their correspondingtransmitting elements in comparison with the prior art construction.

Another embodiment of the present invention which also retains thepossibility of guiding the knife along a straight line in the slide canbe constructed by linking the knife or its rodlike holder directly tothe connecting rod, so that it serves at the same time as the meansmoving the slide, the knife taking the slide along by its own guide butperpendicularly thereto. Then the reciprocating end of the connectingrod runs empty, since it transmits no movement to the slide.

This embodiment provides the following further advantage: it is possibleto move the reciprocating end of the connecting rod in a way differentfrom that of a straight guide. By way of example, this end can be guidedover a fixed swing along a circle or along any desired curve. This makesit possible to influence the movements of the knife in any desiredmanner. The length of the swing can be made adjustable.

Similarly it is possible to shift other parts and lever lengths,particularly the eccentricity of the crank drive, to vary the cuttingrange or to adjust the cutting speeds as well as the feed speeds of theslide.

The invention will appear more clearly from the following detaileddescription when taken in connection with the accompanying drawings,showing by way of example, preferred embodiments of the intentive idea.

In the drawings:

F IG. 1 is a side view, partly in section, of a device of the presentinvention with a knife having the shape of a segment.

FIG. 2 is a transverse section along the line II-Il of FIG. 1.

FIG. 3 is a diagrammatic side view, illustrating a differentconstruction.

FIG. 4 is also a diagrammatic side view illustrating yet anotherconstruction.

FIGS. 1 and 2 show an apparatus having a machine frame for an overhungshear for cutting wire sections. Not shown are a guiding device for thewire which is removed from a band and a device for receiving the wireband, which is located in front of the shear. The apparatus has a guide11 for a slide 12 in which a cutting chuck 13 is replaceably fixed in amanner known in the art. The slide 12 is movable in the direction ofmovement of the wire 14 by a crank drive comprising a driving disc 14a(FIG. 2), a crank shaft 15, a crank disc 16 and a connecting rod 17. Theshaft is supported in ball bearings 18 and 19 carried by the machineframe 10. The crank pin 20 is fixed to a slide ring 21 or is made of onepiece therewith. The slide ring 21 is movable longitudinally in a pinguide 22 and can be set by a setting screw 23 with setting nuts 24 and acounter-nut 25 in relation to the crank disc 16 in such manner that theeccentricity of the crank pin 20 and therefore the stroke of the slide12 in the guides 11 can be varied. The connecting rod 17 is mounted by aneedle bearing 26 in the crank pin 20 and has two arms, the free arm 27extending at an obtuse angle to the arm 28 connected with the crank(FIG. 1). This free arm 27 carries upon an extension 28a a knife 29having the shape of the segment of a circle. The knife 29 can beadjusted by a setting screw 30 in a guide 31 (FIG. 2) and can be rigidlyfixed by a clamping device 32.

The operation of this construction is as follows:

Thus, the crank arm 27 is a one-piece unit, with the needle bearing 26enclosing the pivot point, and the knife blade 29 is fastly securedthereto. The blade 29 is merely adjustable on the crank arm 27.

The operation of the whole device may be summarized as follows:

The driving disk 14a is rotated by any means not shown in the drawings.Its rotation is transmitted by a crank shaft 15, to which it is firmlyconnected to a crank disk 16 constituting a part of the crank shaft. Thecrank disk 16 has a recessed portion forming a pin guide 22. The slidering 21 is movable in the pin guide 22. The crank pin 20 is fixed to theslide ring 21 and carries the needle bearing 26 supporting theconnecting rod 17. The stroke of the slide 21 can be adjusted by a screw23 and nuts 24 and 25. The connecting rod 17 has an arm 28 connectedwith the slide 12 and a bent arm 27 having an extension 27a carrying thecutting blade or knife 29 which is fixed in a clamping device 32. It isapparent that a movement of the rod 17 will cause the knife to cut thewire 14.

According to the embodiment of FIG. 3 the slide 12 movable in the guides11 of the machine frame 10, is provided with a part 33 extended to asubstantial extent under theguides and replaceably carrying at its lowerfree end the cutting chuck 13. A knife holder 34 is mounted in the slide12 and its part 33. The knife holder 34 extends vertically and isslidable transversely to the direction of feed of the wire 14. The lowerend of the holder 34 carries a chisel-like knife 35 which can be setlongitudinally and fixed. The free arm 35a of the connecting rod 17 isaligned. in this construction with the arm 28 connected to the crank andhas an end 36 having the shape of a cylinder head and engaging acorrespondingly shaped slit 37 in the knife holder 34. When the crankdisc 16 is rotated in the direction of the arrow 38, the crank disc willmove the parts in the directions of the double arrow 39 in the guides11', while the knife holder 34 will be moved transversely thereto in thedirection of the double arrow 40.

In this construction the knife holder 34 moves in the direction of thedouble arrow 40 and firmly moves the knife 35. The slide 12 is pivotallyconnected with the arm 28 so that the slide 12 will oscillatehorizontally. The free arm 35a oscillates at the same time along withthe cylindrical head 36 relatively to the slide substantially in thevertical direction, so that the knife holder 34 will move vertically inthe direction of the double arrow 40.

The embodiment of FIG. 4 is substantially similar to the construction ofFIG. 3 as far as the shape of the slide 41 is concerned. However, inthis construction the connecting rod 17" does not engage the slidedirectly but is connected to the upper end of the knife holder 42 whichin other respects is substantially similar to the knife holder 34 ofFIG. 3, namely, it is movable in the direction of the double arrow 40while the slide 41 with the chuck 13" are movable in the direction ofthe double arrow 39. The connecting rod 17" is also provided with a freearm 44 which is aligned with the arm 43 connected to the crank. However,the free arm 44 has an end 45 guided by a link 46 the other end of whichis fixed in a bearing 47. The knife 48 is movable longitudinally at anacute angle to the direction of the wire 14 and thus can be adjustedafter wear. The height of the knife can be adjusted by an adjustment ofthe bearing 47.

It is apparent that the examples described above have been given solelyby way of illustration and not by way of limitation and that they arecapable of many variations and modifications within the scope of thepresent invention.

What is claimed is:

1. An overhung shear for the cutting of a movable wire and the like,comprising a slide, a cutting chuck carried by the slide, a knife guidedby said slide and a crank drive having a connecting rod and atransmission member connected directly with said connecting rod anddirectly actuating said knife, said crank drive moving said slideparallel to the direction of movement of the wire.

2. An overhung shear in accordance with claim 1, comprising a guideadjustably supporting said knife, said knife having the shape of acircular segment and being located to the side of said connecting rod,said crank drive having a crank, said connecting rod having an armconnected with said crank and a free arm extending at an obtuse angle tosaid arm.

3. An overhung shear in accordance with claim 2, wherein said knife isfixed to a rear end of said free arm, said overhung shear comprising asetting screw carried by said free arm and actuating the rear end ofsaid knife.

4. An overhung shear in accordance with claim 2, wherein said free armis angularly adjustable in relation to said knife.

slide, said overhung shear having a knife holder carrying said knife anddirectly connected with said c0nnect ing rod, said knife holder movingsaid slide, and means for guiding the reciprocating end of saidconnecting rod.

7. An overhung shear in accordance with claim 6, wherein thelast-mentioned means comprise a link guiding the reciprocating end alonga curved path.

1. An overhung shear for the cutting of a movable wire and the like,comprising a slide, a cutting chuck carried by the slide, a knife guidedby said slide and a crank drive having a connecting rod and atransmission member connected directly with said connecting rod anddirectly actuating said knife, said crank drive moving said slideparallel to the direction of movement of the wire.
 2. An overhung shearin accordance with claim 1, comprising a guide adjustably supportingsaid knife, said knife having the shape of a circular segment and beinglocated to the side of said connecting rod, said crank drive having acrank, said connecting rod having an arm connected with said crank and afree arm extending at an obtuse angle to said arm.
 3. An overhung shearin accordance with claim 2, wherein said knife is fixed to a rear end ofsaid free arm, said overhung shear comprising a setting screw carried bysaid free arm and actuating the rear end of said knife.
 4. An overhungshear in accordance with claim 2, wherein said free arm is angularlyadjustable in relation to said knife.
 5. An overhung shear in accordancewith claim 2, comprising a knife holder having a recess, said knifebeing longitudinally movable in said knife holder, said transmissionmember consisting of a free arm of the connecting rod, said connectingrod having a crank-connected arm connected with said free arm, said freearm having an end projecting into said recess.
 6. An overhung shear inaccordance with claim 1, whereiN said knife is guided along a straightline by said slide, said overhung shear having a knife holder carryingsaid knife and directly connected with said connecting rod, said knifeholder moving said slide, and means for guiding the reciprocating end ofsaid connecting rod.
 7. An overhung shear in accordance with claim 6,wherein the last-mentioned means comprise a link guiding thereciprocating end along a curved path.